Demonstrations

Charging Electroscope by Induction

Code Number :	5A40.16
Disclaimer:	Reprinted by permission of Dick Berg, University of Maryland, for use on this website. The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources. Further information regarding legal liability in use of demonstrations and labs will be found on the web site Injuries in School/College Laboratories in USA. The University of Iowa Disclaimers: University of Iowa Disclaimer All Rights Reserved..
Condition :	Good
Principle :	Electrostatics
Area of Study :	Electricity & Magnetism
Equipment :	Electroscopes, Plexiglas or PVC rods, cats fur, silk.
Procedure :	Rub the PVC rod with the cats fur. Bring the cats fur near the ball of the electroscope. Touch the ball of the electroscope with your finger. As you move the cats fur away the electroscope should remain charged. This charge should be opposite of the charge held by the PVC rod (negative). Repeat the steps with the Plexiglas rod and silk.

References

Richard S. Halada, "Electrons and Post-it^TMtrons", TPT, Vol. 29, # 8, Nov. 1991, p. 543.

Nobuo Naba, Oleg Jefimenko, "How Can an Electroscope be Charged This Way?", TPT, Vol. 17, # 1, Jan. 1979, p. 56.

Zenon Gubanski, "Conversation of Charge", TPT, Vol. 8, # 5, May 1970, p. 269.

Mario Iona, "Electroscopes Do Not Measure Charge", TPT, Vol. 8, # 8, Nov. 1970, p. 466.

"Charging of an Electroscope", TPT, Vol. 3, # 4, April 1965, p. 185.

"Charging an Electroscope by Induction", TPT, Vol. 3, # 1, Jan. 1965, p. 29.

E-135: "Electroscope - Leaf & Electronic," DICK and RAE Physics Demo Notebook.

Tik Liem, "The Induced Charge," Investigation to Science Inquiry, p. 245.

"180, Inductive Charges?" Christopher P. Jargodzki and Franklin Potter, Mad About Physics, p. 69, 211.

Mail Questions and Comments to: Dale Stille